/
remote.js
2542 lines (2078 loc) · 60.9 KB
/
remote.js
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// Interface to manage connections to rippled servers
//
// - We never send binary data.
// - We use the W3C interface for node and browser compatibility:
// http://www.w3.org/TR/websockets/#the-websocket-interface
//
// This class is intended for both browser and Node.js use.
//
// This class is designed to work via peer protocol via either the public or
// private WebSocket interfaces. The JavaScript class for the peer protocol
// has not yet been implemented. However, this class has been designed for it
// to be a very simple drop option.
var EventEmitter = require('events').EventEmitter;
var util = require('util');
var assert = require('assert');
var LRU = require('lru-cache');
var async = require('async');
var lodash = require('lodash');
var Server = require('./server').Server;
var Request = require('./request').Request;
var Server = require('./server').Server;
var Amount = require('./amount').Amount;
var Currency = require('./currency').Currency;
var UInt160 = require('./uint160').UInt160;
var UInt256 = require('./uint256').UInt256;
var Transaction = require('./transaction').Transaction;
var Account = require('./account').Account;
var Meta = require('./meta').Meta;
var OrderBook = require('./orderbook').OrderBook;
var PathFind = require('./pathfind').PathFind;
var SerializedObject = require('./serializedobject').SerializedObject;
var RippleError = require('./rippleerror').RippleError;
var utils = require('./utils');
var sjcl = require('./utils').sjcl;
var hashprefixes = require('./hashprefixes');
var config = require('./config');
var log = require('./log').internal.sub('remote');
/**
* Interface to manage connections to rippled servers
*
* @param {Object} Connection options.
*/
function Remote(opts) {
EventEmitter.call(this);
var self = this;
var opts = lodash.extend(this, Remote.DEFAULTS, opts);
this.state = 'offline'; // 'online', 'offline'
this._server_fatal = false; // server exited
this._stand_alone = void(0);
this._testnet = void(0);
this._ledger_current_index = void(0);
this._ledger_hash = void(0);
this._ledger_time = void(0);
this._connection_count = 0;
this._connected = false;
this._should_connect = true;
this._transaction_listeners = 0;
this._received_tx = new LRU({ max: 100 });
this._cur_path_find = null;
if (this.local_signing) {
// Local signing implies local fees and sequences
this.local_sequence = true;
this.local_fee = true;
}
this._servers = [ ];
this._primary_server = void(0);
// Cache information for accounts.
// DEPRECATED, will be removed
// Consider sequence numbers stable if you know you're not generating bad
// transactions.
// Otherwise, clear it to have it automatically refreshed from the network.
// account : { seq : __ }
this.accounts = { };
// Account objects by AccountId.
this._accounts = { };
// OrderBook objects
this._books = { };
// Secrets that we know about.
// Secrets can be set by calling set_secret(account, secret).
// account : secret
this.secrets = { };
// Cache for various ledgers.
// XXX Clear when ledger advances.
this.ledgers = {
current: {
account_root: { }
}
};
if (typeof opts.trusted !== 'boolean') {
throw new TypeError('trusted must be a boolean');
}
if (typeof opts.trace !== 'boolean') {
throw new TypeError('trace must be a boolean');
}
if (typeof opts.allow_partial_history !== 'boolean') {
throw new TypeError('allow_partial_history must be a boolean');
}
if (typeof this.max_fee !== 'number') {
throw new TypeError('max_fee must be a number');
}
if (typeof this.max_attempts !== 'number') {
throw new TypeError('max_attempts must be a number');
}
if (typeof this.fee_cushion !== 'number') {
throw new TypeError('fee_cushion must be a number');
}
if (typeof this.local_signing !== 'boolean') {
throw new TypeError('local_signing must be a boolean');
}
if (typeof this.local_fee !== 'boolean') {
throw new TypeError('local_fee must be a boolean');
}
if (typeof this.local_sequence !== 'boolean') {
throw new TypeError('local_sequence must be a boolean');
}
if (typeof this.canonical_signing !== 'boolean') {
throw new TypeError('canonical_signing must be a boolean');
}
if (typeof this.submission_timeout !== 'number') {
throw new TypeError('submission_timeout must be a number');
}
if (typeof this.last_ledger_offset !== 'number') {
throw new TypeError('last_ledger_offset must be a number');
}
if (!Array.isArray(opts.servers)) {
throw new TypeError('servers must be an array');
}
this.setMaxListeners(this.max_listeners);
this.servers.forEach(function(server) {
var connection = self.addServer(server);
connection.setMaxListeners(self.max_listeners);
});
function listenersModified(action, event) {
// Automatically subscribe and unsubscribe to orderbook
// on the basis of existing event listeners
if (~Remote.TRANSACTION_EVENTS.indexOf(event)) {
switch (action) {
case 'add':
if (++self._transaction_listeners === 1) {
self.requestSubscribe('transactions').request();
}
break;
case 'remove':
if (--self._transaction_listeners === 0) {
self.requestUnsubscribe('transactions').request();
}
break;
}
}
};
this.on('newListener', function(event) {
listenersModified('add', event);
});
this.on('removeListener', function(event) {
listenersModified('remove', event);
});
};
util.inherits(Remote, EventEmitter);
Remote.DEFAULTS = {
trusted: false,
trace: false,
allow_partial_history: true,
local_sequence: true,
local_fee: true,
local_signing: true,
canonical_signing: true,
fee_cushion: 1.2,
max_fee: 1000000, // 1 XRP
max_attempts: 10,
submission_timeout: 1000 * 20,
last_ledger_offset: 3,
servers: [ ],
max_listeners: 0 // remove Node EventEmitter warnings
};
Remote.TRANSACTION_EVENTS = [
'transaction',
'transaction_all'
];
// Flags for ledger entries. In support of account_root().
Remote.flags = {
// AccountRoot
account_root: {
PasswordSpent: 0x00010000, // password set fee is spent
RequireDestTag: 0x00020000, // require a DestinationTag for payments
RequireAuth: 0x00040000, // require a authorization to hold IOUs
DisallowXRP: 0x00080000, // disallow sending XRP
DisableMaster: 0x00100000 // force regular key
},
// Offer
offer: {
Passive: 0x00010000,
Sell: 0x00020000 // offer was placed as a sell
},
// Ripple tate
state: {
LowReserve: 0x00010000, // entry counts toward reserve
HighReserve: 0x00020000,
LowAuth: 0x00040000,
HighAuth: 0x00080000,
LowNoRipple: 0x00100000,
HighNoRipple: 0x00200000
}
};
Remote.from_config = function(obj, trace) {
var serverConfig = (typeof obj === 'string') ? config.servers[obj] : obj;
var remote = new Remote(serverConfig, trace);
function initializeAccount(account) {
var accountInfo = config.accounts[account];
if (typeof accountInfo === 'object') {
if (accountInfo.secret) {
// Index by nickname
remote.setSecret(account, accountInfo.secret);
// Index by account ID
remote.setSecret(accountInfo.account, accountInfo.secret);
}
}
};
if (config.accounts) {
Object.keys(config.accounts).forEach(initializeAccount);
}
return remote;
};
/**
* Check that server message is valid
*
* @param {Object} message
* @return Boolean
*/
Remote.isValidMessage = function(message) {
return (typeof message === 'object')
&& (typeof message.type === 'string');
};
/**
* Check that server message contains valid
* ledger data
*
* @param {Object} message
* @return {Boolean}
*/
Remote.isValidLedgerData = function(message) {
return (typeof message === 'object')
&& (typeof message.fee_base === 'number')
&& (typeof message.fee_ref === 'number')
&& (typeof message.ledger_hash === 'string')
&& (typeof message.ledger_index === 'number')
&& (typeof message.ledger_time === 'number')
&& (typeof message.reserve_base === 'number')
&& (typeof message.reserve_inc === 'number');
};
/**
* Check that server message contains valid
* load status data
*
* @param {Object} message
* @return {Boolean}
*/
Remote.isValidLoadStatus = function(message) {
return (typeof message.load_base === 'number')
&& (typeof message.load_factor === 'number');
};
/**
* Check that provided ledger is validated
*
* @param {Object} ledger
* @return {Boolean}
*/
Remote.isValidated = function(message) {
return (message && typeof message === 'object')
&& (message.validated === true);
};
/**
* Set the emitted state: 'online' or 'offline'
*
* @param {String} state
*/
Remote.prototype._setState = function(state) {
if (this.state !== state) {
if (this.trace) {
log.info('set_state:', state);
}
this.state = state;
this.emit('state', state);
switch (state) {
case 'online':
this._online_state = 'open';
this._connected = true;
this.emit('connect');
this.emit('connected');
break;
case 'offline':
this._online_state = 'closed';
this._connected = false;
this.emit('disconnect');
this.emit('disconnected');
break;
}
}
};
/**
* Inform remote that the remote server is not comming back.
*/
Remote.prototype.setServerFatal = function() {
this._server_fatal = true;
};
/**
* Enable debug output
*
* @param {Boolean} trace
*/
Remote.prototype.setTrace = function(trace) {
this.trace = (trace === void(0) || trace);
return this;
};
Remote.prototype._trace = function() {
if (this.trace) {
log.info.apply(log, arguments);
}
};
/**
* Store a secret - allows the Remote to automatically fill
* out auth information.
*
* @param {String} account
* @param {String} secret
*/
Remote.prototype.setSecret = function(account, secret) {
this.secrets[account] = secret;
};
Remote.prototype.addServer = function(opts) {
var self = this;
var server = new Server(this, opts);
function serverMessage(data) {
self._handleMessage(data, server);
};
server.on('message', serverMessage);
function serverConnect() {
self._connection_count += 1;
if (opts.primary) {
self._setPrimaryServer(server);
}
if (self._connection_count === 1) {
self._setState('online');
}
if (self._connection_count === self._servers.length) {
self.emit('ready');
}
};
server.on('connect', serverConnect);
function serverDisconnect() {
self._connection_count--;
if (self._connection_count === 0) {
self._setState('offline');
}
};
server.on('disconnect', serverDisconnect);
this._servers.push(server);
return server;
};
/**
* Reconnect to Ripple network
*/
Remote.prototype.reconnect = function() {
if (!this._should_connect) {
return;
}
log.info('reconnecting');
this._servers.forEach(function(server) {
server.reconnect();
});
return this;
};
/**
* Connect to the Ripple network
*
* @param {Function} callback
* @api public
*/
Remote.prototype.connect = function(online) {
if (!this._servers.length) {
throw new Error('No servers available.');
}
switch (typeof online) {
case 'undefined':
break;
case 'function':
this.once('connect', online);
break;
default:
// Downwards compatibility
if (!Boolean(online)) {
return this.disconnect();
}
}
this._should_connect = true;
this._servers.forEach(function(server) {
server.connect();
});
return this;
};
/**
* Disconnect from the Ripple network.
*
* @param {Function} callback
* @api public
*/
Remote.prototype.disconnect = function(callback) {
if (!this._servers.length) {
throw new Error('No servers available, not disconnecting');
}
var callback = (typeof callback === 'function') ? callback : function(){};
this._should_connect = false;
if (!this.isConnected()) {
callback();
return this;
}
this.once('disconnect', callback);
this._servers.forEach(function(server) {
server.disconnect();
});
this._set_state('offline');
return this;
};
/**
* Handle server message. Server messages are proxied to
* the Remote, such that global events can be handled
*
* It is possible for messages to be dispatched after the
* connection is closed.
*
* @param {JSON} message
* @param {Server} server
*/
Remote.prototype._handleMessage = function(message, server) {
try {
message = JSON.parse(message);
} catch (e) {
}
if (!Remote.isValidMessage(message)) {
// Unexpected response from remote.
this.emit('error', new RippleError('remoteUnexpected',
'Unexpected response from remote'));
return;
}
switch (message.type) {
case 'ledgerClosed':
this._handleLedgerClosed(message, server);
break;
case 'serverStatus':
this._handleServerStatus(message, server);
break;
case 'transaction':
this._handleTransaction(message, server);
break;
case 'path_find':
this._handlePathFind(message, server);
break;
default:
if (this.trace) {
log.info(message.type + ': ', message);
}
break;
}
};
/**
* Handle server ledger_closed event
*
* @param {Object} message
*/
Remote.prototype._handleLedgerClosed = function(message, server) {
var self = this;
// XXX If not trusted, need to verify we consider ledger closed.
// XXX Also need to consider a slow server or out of order response.
// XXX Be more defensive fields could be missing or of wrong type.
// YYY Might want to do some cache management.
if (!Remote.isValidLedgerData(message)) {
return;
}
var ledgerAdvanced = message.ledger_index >= this._ledger_current_index;
if (isNaN(this._ledger_current_index) || ledgerAdvanced) {
this._ledger_time = message.ledger_time;
this._ledger_hash = message.ledger_hash;
this._ledger_current_index = message.ledger_index + 1;
if (this.isConnected()) {
this.emit('ledger_closed', message, server);
} else {
this.once('connect', function() {
// Delay until server is 'online'
self.emit('ledger_closed', message, server);
});
}
}
};
/**
* Handle server server_status event
*
* @param {Object} message
*/
Remote.prototype._handleServerStatus = function(message, server) {
this.emit('server_status', message, server);
};
/**
* Handle server transaction event
*
* @param {Object} message
*/
Remote.prototype._handleTransaction = function(message, server) {
// XXX If not trusted, need proof.
var transactionHash = message.transaction.hash;
if (this._received_tx.get(transactionHash)) {
// De-duplicate transactions
return;
}
if (message.validated) {
this._received_tx.set(transactionHash, true);
}
if (this.trace) {
log.info('tx:', message);
}
var metadata = message.meta || message.metadata;
if (metadata) {
// Process metadata
message.mmeta = new Meta(metadata);
// Pass the event on to any related Account objects
message.mmeta.getAffectedAccounts().forEach(function(account) {
if (this._accounts[account]) {
this._accounts[account].notify(message);
}
}, this);
// Pass the event on to any related OrderBooks
message.mmeta.getAffectedBooks().forEach(function(book) {
if (this._books[book]) {
this._books[book].notify(message);
}
}, this);
} else {
// Transaction could be from proposed transaction stream
[ 'Account', 'Destination' ].forEach(function(prop) {
if (this._accounts[message.transaction[prop]]) {
this._accounts[message.transaction[prop]].notify(message);
}
}, this);
}
this.emit('transaction', message, server);
this.emit('transaction_all', message, server);
};
/**
* Handle server path_find event
*
* @param {Object} message
*/
Remote.prototype._handlePathFind = function(message, server) {
// Pass the event to the currently open PathFind object
if (this._cur_path_find) {
this._cur_path_find.notify_update(message);
}
this.emit('path_find_all', message, server);
};
/**
* Returns the current ledger hash
*
* @return {String} ledger hash
*/
Remote.prototype.getLedgerHash = function() {
return this._ledger_hash;
};
/**
* Set primary server. Primary server will be selected
* to handle requested regardless of its internally-tracked
* priority score
*
* @param {Server} server
*/
Remote.prototype._setPrimaryServer =
Remote.prototype.setPrimaryServer = function(server) {
if (this._primary_server) {
this._primary_server._primary = false;
}
this._primary_server = server;
this._primary_server._primary = true;
};
/**
* Get connected state
*
* @return {Boolean} connected
*/
Remote.prototype.isConnected = function() {
return this._connected;
};
/**
* Get array of connected servers
*/
Remote.prototype.getConnectedServers = function() {
var servers = [ ];
for (var i = 0; i < this._servers.length; i++) {
if (this._servers[i].isConnected()) {
servers.push(this._servers[i]);
}
}
return servers;
};
/**
* Select a server to handle a request. Servers are
* automatically prioritized
*/
Remote.prototype._getServer =
Remote.prototype.getServer = function() {
if (this._primary_server && this._primary_server.isConnected()) {
return this._primary_server;
}
if (!this._servers.length) {
return null;
}
var connectedServers = this.getConnectedServers();
if (connectedServers.length === 0 || !connectedServers[0]) {
return null;
}
var server = connectedServers[0];
var cScore = server._score + server._fee;
for (var i = 1; i < connectedServers.length; i++) {
var _server = connectedServers[i];
var bScore = _server._score + _server._fee;
if (bScore < cScore) {
server = _server;
cScore = bScore;
}
}
return server;
};
/**
* Send a request. This method is called internally by Request
* objects. Each Request contains a reference to Remote, and
* Request.request calls Request.remote.request
*
* @param {Request} request
*/
Remote.prototype.request = function(request) {
if (typeof request === 'string') {
if (!/^request_/.test(request)) {
request = 'request_' + request;
}
if (typeof this[request] === 'function') {
var args = Array.prototype.slice.call(arguments, 1);
return this[request].apply(this, args);
}
throw new Error('Command does not exist: ' + request);
}
if (!(request instanceof Request)) {
throw new Error('Argument is not a Request');
}
if (!this._servers.length) {
return request.emit('error', new Error('No servers available'));
}
if (!this.isConnected()) {
return this.once('connect', this.request.bind(this, request));
}
if (request.server === null) {
return request.emit('error', new Error('Server does not exist'));
}
var server = request.server || this.getServer();
if (server) {
server._request(request);
} else {
request.emit('error', new Error('No servers available'));
}
};
/**
* Request ping
*
* @param [String] server host
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.ping =
Remote.prototype.requestPing = function(host, callback) {
var request = new Request(this, 'ping');
switch (typeof host) {
case 'function':
callback = host;
break;
case 'string':
request.setServer(host);
break;
}
var then = Date.now();
request.once('success', function() {
request.emit('pong', Date.now() - then);
});
request.callback(callback, 'pong');
return request;
};
/**
* Request server_info
*
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.requestServerInfo = function(callback) {
return new Request(this, 'server_info').callback(callback);
};
/**
* Request ledger
*
* @return {Request} request
*/
Remote.prototype.requestLedger = function(options, callback) {
// XXX This is a bad command. Some variants don't scale.
// XXX Require the server to be trusted.
// utils.assert(this.trusted);
var request = new Request(this, 'ledger');
switch (typeof options) {
case 'undefined': break;
case 'function':
callback = options;
break;
case 'object':
if (!options) {
break;
}
Object.keys(options).forEach(function(o) {
switch (o) {
case 'full':
case 'expand':
case 'transactions':
case 'accounts':
request.message[o] = true;
break;
case 'ledger':
request.selectLedger(options.ledger);
break;
case 'ledger_index':
case 'ledger_hash':
request.message[o] = options[o];
break;
case 'closed' :
case 'current' :
case 'validated' :
request.message.ledger_index = o;
break;
}
}, options);
break;
default:
request.selectLedger(options);
break;
}
request.callback(callback);
return request;
};
/**
* Request ledger_closed
*
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.requestLedgerClosed =
Remote.prototype.requestLedgerHash = function(callback) {
// utils.assert(this.trusted); // If not trusted, need to check proof.
return new Request(this, 'ledger_closed').callback(callback);
};
/**
* Request ledger_header
*
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.requestLedgerHeader = function(callback) {
return new Request(this, 'ledger_header').callback(callback);
};
/**
* Request ledger_current
*
* Get the current proposed ledger entry. May be closed (and revised)
* at any time (even before returning).
*
* Only for unit testing.
*
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.requestLedgerCurrent = function(callback) {
return new Request(this, 'ledger_current').callback(callback);
};
/**
* Request ledger_data
*
* Get the contents of a specified ledger
*
* @param {Object} options
* @property {Boolean} [options.binary] - Flag which determines if rippled returns binary or parsed JSON
* @property {String|Number} [options.ledger] - Hash or sequence of a ledger to get contents for
* @property {Number} [options.limit] - Number of contents to retrieve from the ledger
* @property {Function} callback
*
* @callback
* @param {Error} error
* @param {LedgerData} ledgerData
*
* @return {Request} request
*/
Remote.prototype.requestLedgerData = function(options, callback) {
var request = new Request(this, 'ledger_data');
request.message.binary = options.binary !== false;
request.selectLedger(options.ledger);
request.message.limit = options.limit;
request.once('success', function(res) {
if (options.binary === false) {
request.emit('state', res);
return;
}
function iterator(ledgerData, next) {
async.setImmediate(function() {
next(null, Remote.parseBinaryLedgerData(ledgerData));
});
};
function complete(err, state) {
if (err) {
request.emit('error', err);
} else {
res.state = state;
request.emit('state', res);
}
};
async.mapSeries(res.state, iterator, complete);
});
request.callback(callback, 'state');
return request;
};
/**
* Request ledger_entry
*
* @param [String] type
* @param [Function] callback
* @return {Request} request
*/
Remote.prototype.requestLedgerEntry = function(type, callback) {
// utils.assert(this.trusted);
// If not trusted, need to check proof, maybe talk packet protocol.
var self = this;